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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5079f92483ff6c482fd5cd007d7637d791e3321bdcd7913df3c67cddb970d256' 
  AND token = 'Rm89lSVMJ4lvAvy+7WIxOjQu98/lhvcYIAAhHC/Bom8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}